Rudbeckia plant named ‘RUDHT37’

ABSTRACT

A new and distinct cultivar of  Rudbeckia  plant named ‘RUDHT37’, characterized by its broadly upright and mounded plant habit; freely branching growth habit; freely flowering habit; large single-type inflorescences with yellow orange-colored ray florets positioned above the foliar plane on strong peduncles; and good garden and container performance.

Botanical designation: Rudbeckia hirta.

Cultivar denomination: ‘RUDHT37’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Rudbeckia plant, botanically known as Rudbeckia hirta, commonly referred to as Black-eyed Susan, and hereinafter referred to by the name ‘RUDHT37’.

The new Rudbeckia plant is a product of a planned breeding program conducted by the Inventor in Zuidwolde, The Netherlands. The objective of the breeding program is to create new vigorous Rudbeckia plants with large attractive inflorescences.

The new Rudbeckia plant originated from a cross-pollination made by the Inventor in Zuidwolde, The Netherlands in July, 2015 of two unnamed proprietary seedling selections of Rudbeckia hirta, not patented. The new Rudbeckia plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination in a controlled environment in Zuidwolde, The Netherlands in July, 2016.

Asexual reproduction of the new Rudbeckia by in vitro meristem culture in a controlled greenhouse environment in Zuidwolde, The Netherlands since March, 2017 has shown that the unique features of this new Rudbeckia are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Rudbeckia have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘RUDHT37’. These characteristics in combination distinguish ‘RUDHT37’ as a new and distinct Rudbeckia plant:

-   -   1. Broadly upright and mounded plant habit.     -   2. Freely branching growth habit.     -   3. Freely flowering habit.     -   4. Large single-type inflorescences with yellow orange-colored         ray florets positioned above the foliar plane on strong         peduncles.     -   5. Good garden and container performance.

Plants of the new Rudbeckia differ from plants of the parent selections in the following characteristics in plant habit as plants of the new Rudbeckia are more compact and uniform than plants of the parent selections.

Plants of the new Rudbeckia can be compared to Rudbeckia hirta X Echinacea purpurea ‘ET-RDB 02’, disclosed in U.S. Plant Pat. No. 25,243. Plants of the new Rudbeckia differ primarily from plants of ‘ET-RDB 02’ in the following characteristics:

-   -   1. Plants of the new Rudbeckia are taller than plants of ‘ET-RDB         02’.     -   2. Plants of the new Rudbeckia and ‘ET-RDB 02’ differ in ray         floret color as plants of ‘ET-RDB 02’ have yellow, orange and         reddish-colored ray florets.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate the overall appearance of the new Rudbeckia showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Rudbeckia.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘RUDHT37’ grown in a container.

The photograph at the top of the second sheet is a close-up view of typical leaves of ‘RUDHT37’.

The photograph at the bottom of the second sheet is a close-up view of a typical inflorescence of ‘RUDHT37’ .

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations, measurements and values describe plants grown in 19-cm containers during the late summer and early autumn in an outdoor nursery in Zuidwolde, The Netherlands and under cultural conditions typical of commercial Rudbeckia production. During the production of the plants, day temperatures ranged from 18° C. to 30° C. and night temperatures ranged from 6° C. to 18° C. Plants were 18 weeks old when the photographs were taken and 17 weeks old when the detailed description was taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2015 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Rudbeckia hirta ‘RUDHT37’. -   Parentage:     -   -   Female, or seed, parent.—Unnamed proprietary seedling             selection of Rudbeckia hirta, not patented.         -   Male, or pollen, parent.—Unnamed proprietary seedling             selection of Rudbeckia hirta, not patented. -   Propagation:     -   -   Type.—By in vitro meristem culture.         -   Time to initiate roots.—About ten days at soil temperatures             about 15° C. and ambient temperatures about 20° C.         -   Time to produce a rooted young plants.—About 30 to 35 days             at soil temperatures about 15° C. and ambient temperatures             about 20° C.         -   Root description.—Medium in thickness; fleshy; typically             white in color, actual color of the roots is dependent on             substrate composition, water quality, fertilizers, substrate             temperature and physiological age of roots.         -   Rooting habit.—Freely branching; medium density. -   Plant description:     -   -   Plant and growth habit.—Herbaceous perennial; broadly             upright and mounded plant habit; strong and freely branching             growth habit with about seven primary lateral branches each             with about three secondary lateral branches; dense and bushy             appearance; moderately vigorous to vigorous growth habit;             medium to rapid growth rate.         -   Plant height.—About 64 cm.         -   Plant width.—About 47.8 cm.         -   Lateral branches.—Length: About 28.6 cm. Diameter: About             7 mm. Internode length: About 4 cm. Angle: Primary lateral             branches are upright to about 20° from vertical and             secondary lateral branches are about 15° from primary             lateral branches axis. Strength: Moderately strong. Texture             and luster: Densely pubescent; moderately glossy. Lenticels:             None observed on plants of the new Rudbeckia. Color:             Developing branches, close to 144B; developed branches,             close to 144B with axillary stripes, close to 143A, and at             the nodes, close to N186C. -   Leaf description:     -   -   Arrangement.—Alternate, simple; sessile.         -   Length.—About 15.2 cm.         -   Width.—About 4.9 cm.         -   Shape.—Narrowly obovate.         -   Apex.—Acute.         -   Base.—Truncate to cuneate.         -   Margin.—Serrate.         -   Texture and luster, upper and lower surfaces.—Pubescent,             rough; matte.         -   Venation pattern.—Pinnate.         -   Color.—Developing leaves, upper surface: Close to 137D.             Developing leaves, lower surface: Close to 138B. Fully             expanded leaves, upper surface: Close to 137A; venation,             close to 145B to 145C. Fully expanded leaves, lower surface:             Close to 137B to 137C; venation, close to 143D. -   Inflorescence description:     -   -   Type and arrangement.—Single-type inflorescence form with             obovate-shaped ray florets and tubular disc florets;             inflorescences borne on terminal and axillary peduncles             above and beyond the foliar plane on strong peduncles; ray             and disc florets arranged acropetally on a capitulum.         -   Fragrance.—None detected.         -   Flowering season.—Plants begin flowering about 100 days             after planting; long flowering period, plants flower             continuously during the late summer to late autumn in The             Netherlands.         -   Inflorescence longevity.—Good postproduction longevity with             inflorescences lasting about two to five weeks on the plant;             inflorescences not persistent.         -   Quantity of inflorescences.—Freely flowering habit,             typically about 21 developing and fully developed             inflorescences at one time.         -   Inflorescence buds.—Height: About 2.7 cm. Diameter: About             2.3 cm. Shape: Broadly ovate. Texture and luster: Densely             pubescent; matte. Color: Close to 151D.         -   Inflorescences.—Diameter: About 13.9 cm. Depth (height):             About 5.3 cm. Diameter of disc: About 3.4 cm. Receptacle             height: About 1.8 cm. Receptacle diameter: About 1.7 cm.             Receptacle shape: Ovate. Receptacle color: Close to 155C.         -   Ray florets.—Quantity and arrangement: About 20 per             inflorescence arranged in a single whorl. Length: About             6.3 cm. Width: About 2.8 cm. Shape: Obovate. Apex:             Emarginate to praemorse. Base: Cuneate. Margin: Entire.             Aspect: When developing, upright and when fully opened,             outwardly. Texture and luster, upper surface: Smooth,             glabrous; velvety; matte. Texture and luster, lower surface:             Densely pubescent; slightly velvety; matte. Color: When             opening, upper surface: Close to 14A. When opening, lower             surface: Close to 12A; fading towards the base, close to 10A             to 10B. Fully opened, upper surface: Close to 17B; fading             towards the apex, close to 14B. Fully opened, lower surface:             Close to 13B.         -   Disc florets.—Quantity and arrangement: About 1,000 per             inflorescence arranged in a spiral of about 20 whorls.             Length: About 1 cm. Width: About 3 mm. Shape: Lower 85%             fused and tubular, elongated. Apex: Acute. Aspect: Upright.             Texture and luster: Smooth, glabrous; glossy. Color, when             opening and fully opened, inner and outer surfaces: Close to             between N186C and 200A, closest to N186C; mid-section, close             to 186A; towards the base, close to 155A.         -   Phyllaries.—Quantity and arrangement: About 32 per             inflorescence arranged in about two whorls. Length: About             3.4 cm. Width: About 8mm. Shape: Narrowly obovate. Apex:             Acute. Base: Broadly cuneate. Margin: Entire. Texture and             luster, upper and lower surfaces: Densely pubescent; matte.             Color, upper surface: Close to 137B. Color, lower surface:             Close to 137D.         -   Peduncles.—Length: About 16.8 cm. Diameter: About 6 mm.             Strength: Strong. Aspect: Mostly upright. Texture and             luster: Densely pubescent; moderately glossy. Color: Close             to 144A to 144B with axillary stripes, close to 143A.         -   Reproductive organs.—Androecium (present only on disc             florets): Quantity per disc floret: About five. Filament             length: About 3 mm. Filament color: Close to 155A. Anther             shape: Narrowly oblong. Anther length: About 3 nun. Anther             width: About 0.5 mm. Anther color: Close to 200A. Pollen             amount: Scarce. Pollen color: Close to 17A. Gynoecium             (present only on disc florets): Pistil length: About 7 mm.             Style length: About 5.5 mm. Style color: Close to 155A.             Stigma diameter: About 3 mm. Stigma shape: Cleft, decurrent.             Stigma color: Close to between 200A and 202A. Ovary color:             Close to 197C.         -   Seeds and fruits.—Seed and fruit production has not been             observed on plants of the new Rudbeckia to date. -   Disease & pest resistance: Plants of the new Rudbeckia have not been     observed to be resistant to pathogens and pests common to Rudbeckia     plants. -   Garden performance: Plants of the new Rudbeckia have been observed     to have good garden performance and to tolerate wind, rain, high     temperatures about 35° C. and to be suitable for USDA Hardiness     Zones 5 to 10. 

It is claimed:
 1. A new and distinct Rudbeckia plant named ‘RUDHT37’ as illustrated and described. 